Attachment for carburetors



Nov. 12, 1935. J. M. NICKELSEN 2,020,903

ATTACHMENT FOR CARBURETORS.

Filed July 18, 1932 John M Nickelaen,

Patented Nov. 12, 1935 UNITED STATES PATENT OFFICE 2,020.90: a'r'racmum'r roa cannons-mas Application July 16,

2 Claimastruction, may be econonncally produced in large quantities, and assembled with facility.

Die several objects, advantages and novel details of construction of the invention will be made more apparent as this description proceeds, especially when considered in connection.

with the accompanying drawing, wherein Fig. 1 is a-viewpartly in vertical section and "partly in elevation of an air filter constructed in accordance with this invention;

Pig. .2 is a vertical sectional view through a modified form of construction, and

Fig. 3 is an enlarged fragmentary detail sectional view.

Referring now more particularly to Fig. 1, it will be noted that there is an outer housing ll of tubular construction 'formed preferably of sheet metal to the lower end ofwhich a funnel shaped member ii is attached, the latter beingprovided with a flanged opening l2 by means of which the device is attached to the air intake of the carburetor, in any preferred or desired manner.

The upper end of the housing I. is provided with a cover It provided with a flanged opening -ll to which an air conduit, of substantiaily the form of a Venturi tube It, is attached. The Venturi or air tube l5 extends downwardly within the housing I. to a point spaced above the botthom thereof, as clearly illustrated in the draw- Secured to the housing ll adjacent the top thereof is a dome-shaped cover i6, this cover being spaced above the top of the housing and cirrelatively thick layer of noise absorbing or deadv 1932, serial No. mess ening material 26 preferablygsufiicient to substantia'liy fill this space. Y

The shape of the lower end member I I is preferably such as to provide an annular shoulder 2i upon which a filter unit 22 may rest. This 5 filter unit preferably consists of an outer shell 23 and top and bottom walls 24 of wire mesh or screen material. The filter material contained within the walls is preferably copper wool or glass wool or some other generally similar type 10 of material. A spacer ring 25 is preferably inserted in the housing It between the noise ab sorbing material 26 and the top of the filter unit 22.

As shown by arrows, the air in this form of 15 construction flows through the space between the housing and the periphery of the cover and centrally through the Venturi tube It, through the filter unit 22 and out through the discharge opening l2. The dome-shaped cover l6 acts to prevent coarse sand or dirt from entering the filter unit, the finer particles of foreign matter which are carried along with the air being arrested by the filter unit. The layer of sound deadening material It acts to dampen vibrations and the layer of sound absorbing material 2!! acts to absorb or subdue the engine noises which normally tend to escape through the air filter. The filter unit, in addition to cleaning the air, will act to prevent backfire from the carburetor passing outwardly through the unit to the atmosphere. By forming the air conduitor tube ii in substantially the shape of the Venturi tube the air restriction through the device is reduced and the air is directed through the device in the desired path.

This filter unit may be removed for replacement purposes by removing the cover l6, insulation 26, and spacer 26.

In Figure 2, I have illustrated a slightly modi- 4o fied form of construction in which the outer housing is indicated by the reference character 26 to the lower end of which is connected a member 21 provided with a flanged discharge opening 26 adapted to be connected to the air intake of 45 the carburetor. The other end of the housing 26 is provided with'an end plate 26 substantially funnel-shaped in cross-section provided with a flanged opening 66 to which a substantially Venturi-shaped air conduit ii is connected, this 50 venturi extending down within the boundaries of the funnel-shaped lower wall 21 as clearly illustrated. The space 32 between the 'Venturl shaped air conduit 3| and the outer housing 26 is preferably left vacant to provide a dead air space which will also act to absorb or deaden noise. This space may be illled with some sound absorbing or deadening material if desired.

The reference character 33 indicates a filter unit which in this form of construction is secured to the top of the housing 26, this unit comprising an outer wall 34 o! imperi'orate material and top and bottom walls 35 of wire mesh, the filter unit being filled with copper wool, glass wool, or some other generally similar material. Surrounding the top 01' the structure is a domeshaped cover 36 which is secured in spaced relation thereto by means oi spaces 31 through which the screws 38 pass to secure the cover to the top of the device.

In this form oi construction, the filter unit is located adjacent the top of the device and the air flows therethrough before passing through the Venturi-shaped air conduit 3|.

If desired, the air conduit 3! may be provided with downwardly opening louvres 39 projecting into the interior-of the conduit. By this means backfire noises and the like traveling upwardly through the conduit are directed into the surrounding chamber 32 and muiiled or absorbed.

While two forms of construction have herein been illustrated, it will be apparent that various modifications may msest themselves to those skilled in this art, and to this end reservation is made to make such changes as may come within the purview of the accompanying claims.

What I claim as nw invention is:

1. An attachment for carburetors comprising a housing provided at one end with an air discharge opening and having a reentrant air inlet opening at theopposite end, a Venturi-shaped 1 air conduit extending between said inlet and discharge openings and spaced from the side walls oi the housing forming a sound absorbing chamber around said conduit.

2. An attachment for carburetors comprising a 1 housing provided at one end with an air discharge opening and having a reentrant air inlet opening at the opposite end, an air conduit extending between said inlet and discharge openings and located within the housing in spaced relation 2 to the side walls thereof forming a sound absorbing chamber around said conduit, and inwardly extending downwardly opening louvres formed in said air conduit, for the purpose set forth.

JOHN M. NICKEISEN. 

